x1, y1, x2, y2 = map(float, input().split())

x = abs(x2 - x1)
y = abs(y2 - y1)

dis = (x ** 2 + y ** 2) ** (1 / 2)
dis = round(dis, 8)

print("{}" .format(dis)) x1, y1, x2, y2 = map(float, input().split()) x1 map(float, input().split()) map float input().split() ().split () input split y1 x2 y2 x = abs(x2 - x1) x abs(x2 - x1) abs x2 - x1 x2 x1 y = abs(y2 - y1) y abs(y2 - y1) abs y2 - y1 y2 y1 dis = (x ** 2 + y ** 2) ** (1 / 2) dis (x ** 2 + y ** 2) ** (1 / 2) x ** 2 + y ** 2 x ** 2 x 2 y ** 2 y 2 1 / 2 1 2 dis = round(dis, 8) dis round(dis, 8) round dis 8 print("{}" .format(dis)) print "{}" .format(dis) "{}" .format "{}" format dis y2 = map(float, input().split()) map(float, input().split()) y2 y1, x2, y2 = map(float, input().split()) map(float, input().split()) y1 x = abs(x2 - x1) abs(x2 - x1) x x2, y2 = map(float, input().split()) map(float, input().split()) x2 x1, y1, x2, y2 = map(float, input().split()) map(float, input().split()) x1 y = abs(y2 - y1) abs(y2 - y1) y dis = (x ** 2 + y ** 2) ** (1 / 2) (x ** 2 + y ** 2) ** (1 / 2) dis dis = round(dis, 8) round(dis, 8) dis
x1, y1, x2, y2 = map(float, input().split())

x = abs(x2 - x1)
y = abs(y2 - y1)

dis = (x ** 2 + y ** 2) ** (1 / 2)
dis = round(dis, 8)

print("{}" .format(dis))
